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/*
* Media Controller ancillary functions
*
* (c) 2016 Mauro Carvalho Chehab <mchehab@osg.samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <media/media-entity.h>
#include <media/v4l2-mc.h>
int v4l2_mc_create_media_graph(struct media_device *mdev)
{
struct media_entity *entity;
struct media_entity *if_vid = NULL, *if_aud = NULL, *sensor = NULL;
struct media_entity *tuner = NULL, *decoder = NULL;
struct media_entity *io_v4l = NULL, *io_vbi = NULL, *io_swradio = NULL;
bool is_webcam = false;
u32 flags;
int ret;
if (!mdev)
return 0;
media_device_for_each_entity(entity, mdev) {
switch (entity->function) {
case MEDIA_ENT_F_IF_VID_DECODER:
if_vid = entity;
break;
case MEDIA_ENT_F_IF_AUD_DECODER:
if_aud = entity;
break;
case MEDIA_ENT_F_TUNER:
tuner = entity;
break;
case MEDIA_ENT_F_ATV_DECODER:
decoder = entity;
break;
case MEDIA_ENT_F_IO_V4L:
io_v4l = entity;
break;
case MEDIA_ENT_F_IO_VBI:
io_vbi = entity;
break;
case MEDIA_ENT_F_IO_SWRADIO:
io_swradio = entity;
break;
case MEDIA_ENT_F_CAM_SENSOR:
sensor = entity;
is_webcam = true;
break;
}
}
/* It should have at least one I/O entity */
if (!io_v4l && !io_vbi && !io_swradio)
return -EINVAL;
/*
* Here, webcams are modelled on a very simple way: the sensor is
* connected directly to the I/O entity. All dirty details, like
* scaler and crop HW are hidden. While such mapping is not enough
* for mc-centric hardware, it is enough for v4l2 interface centric
* PC-consumer's hardware.
*/
if (is_webcam) {
if (!io_v4l)
return -EINVAL;
media_device_for_each_entity(entity, mdev) {
if (entity->function != MEDIA_ENT_F_CAM_SENSOR)
continue;
ret = media_create_pad_link(entity, 0,
io_v4l, 0,
MEDIA_LNK_FL_ENABLED);
if (ret)
return ret;
}
if (!decoder)
return 0;
}
/* The device isn't a webcam. So, it should have a decoder */
if (!decoder)
return -EINVAL;
/* Link the tuner and IF video output pads */
if (tuner) {
if (if_vid) {
ret = media_create_pad_link(tuner, TUNER_PAD_OUTPUT,
if_vid,
IF_VID_DEC_PAD_IF_INPUT,
MEDIA_LNK_FL_ENABLED);
if (ret)
return ret;
ret = media_create_pad_link(if_vid, IF_VID_DEC_PAD_OUT,
decoder, DEMOD_PAD_IF_INPUT,
MEDIA_LNK_FL_ENABLED);
if (ret)
return ret;
} else {
ret = media_create_pad_link(tuner, TUNER_PAD_OUTPUT,
decoder, DEMOD_PAD_IF_INPUT,
MEDIA_LNK_FL_ENABLED);
if (ret)
return ret;
}
if (if_aud) {
ret = media_create_pad_link(tuner, TUNER_PAD_AUD_OUT,
if_aud,
IF_AUD_DEC_PAD_IF_INPUT,
MEDIA_LNK_FL_ENABLED);
if (ret)
return ret;
} else {
if_aud = tuner;
}
}
/* Create demod to V4L, VBI and SDR radio links */
if (io_v4l) {
ret = media_create_pad_link(decoder, DEMOD_PAD_VID_OUT,
io_v4l, 0,
MEDIA_LNK_FL_ENABLED);
if (ret)
return ret;
}
if (io_swradio) {
ret = media_create_pad_link(decoder, DEMOD_PAD_VID_OUT,
io_swradio, 0,
MEDIA_LNK_FL_ENABLED);
if (ret)
return ret;
}
if (io_vbi) {
ret = media_create_pad_link(decoder, DEMOD_PAD_VBI_OUT,
io_vbi, 0,
MEDIA_LNK_FL_ENABLED);
if (ret)
return ret;
}
/* Create links for the media connectors */
flags = MEDIA_LNK_FL_ENABLED;
media_device_for_each_entity(entity, mdev) {
switch (entity->function) {
case MEDIA_ENT_F_CONN_RF:
if (!tuner)
continue;
ret = media_create_pad_link(entity, 0, tuner,
TUNER_PAD_RF_INPUT,
flags);
break;
case MEDIA_ENT_F_CONN_SVIDEO:
case MEDIA_ENT_F_CONN_COMPOSITE:
case MEDIA_ENT_F_CONN_TEST:
ret = media_create_pad_link(entity, 0, decoder,
DEMOD_PAD_IF_INPUT,
flags);
break;
default:
continue;
}
if (ret)
return ret;
flags = 0;
}
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_mc_create_media_graph);
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